The Zeta Project

The Zeta Project is a science fiction American animated series, first aired on Kids' WB in January 2001. It was a spinoff of the series Batman Beyond.The story's main character, Infiltration Unit Zeta, is a government robot designed to destroy and (via holographic projections) impersonate targeted individuals. However, while observing a target. Zeta experiences a kind of existential crisis about goodness and the value of life; following this epiphany Zeta finds it can no longer kill. The newly enlightened Zeta refuses to continue on as an infiltration unit and abandons its government service.
See more at Wikipedia.org...